Lacquer for application by brushing



Patented Apr. 21, 1931 UNITED STATES rusram mmnemmmscmr,

m, A CORPORATION OFGM PATENT OFFICE ms rmnns'rm, OI. UEBDINGEII NIEDEBBHIIN, G, ABSIGNOB TO I. G.

OI; raannonr-on-rrm-nm, oxamceunn iron sermon-r102; BY nausnme Io Drawing. Application fled July 18, 1928, Serial No. 282,508, and in .Germany December 22, 1m. 7

The present invention relates to new and improved lacquers for a plication by brushing, which contain co odion cotton. The manufacture of such lacquers has hitherto afforded great difliculties since the usual solvents for such lac uers suchas butyl acetate, amyl acetate, cyclo exanone and the like, are either too readily volatile or objectionable in view of their strong and irritating smell. 10 Moreover the said solvents possess the highly objectionable property, when applied to dry cellulose nitrate coatings, to swell or disolve the same to a" considerable extent, whereby the suitablity of the lacquers for brushing, 18 their capability of forming smooth surfaces and the time required for drying are unfavourably influenced.

7 By my present invention I claim to have successfully overcome the said difiiculties and 20 to be able to produce good lacquers for application by brushing. v

I have folmd that good lacquers for application by brushing are obtained when dissolvingfrom 8 to parts of a collodion cotton which forms solutions of low viscosity and of which at least 15 per cent are soluble in 96 per cent ethyl alcohol, in from 25 to 60 parts of a solvent which corresponds to the general formula HO--C,,H --OR (in 80 which R indicates an alkyl group with from 1 to 4 carbon atoms and an n is 2, 3 or 4) and which contains at least 5 carbon atoms in its molecule and from 67 to 10 parts of a solvent containing a substantial proportion of ethyl alcohol. The solvent containing a substantial proportion of ethyl alcohol may consist of ethyl alcohol alone, but may also contain methanol, isopropyl alcohol, butanol, or one these substances. Generally speaking it should .contain at least of ethyl alcohol.

The amount of collodion cotton to be employed depends on its viscosity, that/means greater amounts of a collodion cotton furnishing solutions of low viscosity can be made into a lacquer capable of being applied by brushing than of a collodion cotton furnishing solutions of greater viscosity. Having regard to this, lac uers for application by brushing which fulfi the aforementioned of the usual solvents or diluents or several of requirements can be produced from any kind of collodion cotton.

I may also incorporate with my improved lacquers many natural and artificial resins com atible with collodion cotton, for examp e artificial resins obtained by polymerizatlon of vinyl esters preferably in an amount of from 10 to per cent by weight of the a dry weight of the'collodion cotton employed.

It is most advantageous to employ artificial resins obtained from cyclic ketones such as cyclohexanone, with or without the aid of phenols and aldehydes. Also plasticizers and small quantities of drying or nondrying OllS may be added to the solutions, and the lacquers may be colored by the addition of suitable coloring matters so as to produce transparent or covering lacquers.

It will be obvious from the foregoing general explanations that it is possible accord ing to my present invention to vary the properties of the lacquers within very wide limits and tomeet all requirements of practice, for example as regards the hardness, suppleness, adhesiveness, and lustre of the coatings, the time required for drying and the like.

The following example will further illustrate the nature of my lIlYfiIltlOIl which, how- 'ever, is not limited to this example. The

parts are by weight.

E sample-20 'parts of a collodion cotton,

about per cent of which are soluble in 96 per cent ethyl alcohol,5 parts of an artificial resin prepared from cyclohexanone, formaldehyde and phenol, and 8 parts of tricresyl phosphate are dissolved in 45 parts of propyle'ne g ycol monopropyl ether or of a mixture of propylene glycol monomethyl ether with ethylene glycol monobutyl ether, whereupon a mixture of 15 parts of ethyl alcohol, 10 parts of cyclohexanone and 5 parts of toluene is added. The resulting lacquer is readily applicable by brushing to any kind of support, for example coatings of oil paint, and furnishes coatings of great hardness and stability.

What I claim is:

1. A lacquer for'application by brushing, comprising from 8 to 25 parts of collodion cotton which forms solutions of low viscosdehy it? and of which at least 15 r cent are solu la in 96 per cent ethyl alco 01, an artificial cyclic ketone resin, a softener, from '25 to 60 parts of a solvent which corres onds to the neral formula HO-C,H,,,O (in which indicates an alkyl-group with from 1 to 4 carbon atoms and n is 2, 3 or 4) and which contains at least 5 carbon atoms in its molecule, and from 67 to parts of a solvent containm a substantial proportion of ethyl..-

alcoho 2. A lacquer for application by brushing, comprising from 8 to 25 parts of collodion cotton which forms solutions of low viscosity and of which at least per cent are soluble in 96 per cent 'ethyl' alcohol, an artificial resin Jxrepared from cyclohexanone, formale and phenol, a softener, from to 60 parts of a solvent which corres oxide to the eneral formula 'HO C,,H ,--O (in which lt indicates an alkyl contains at least 5 carbon atoms in its molecule, and from 67 to 10 parts of a solvent containing a substantial proportion of ethyl alcohol.

3. A lacquer for application by brushing,

comprising 20 parts of a collodion cotton, about 90 per cent of which are soluble in 96 per cent ethyl alcohol, 5 arts of an artificial resin repared from cyc ohexanone, formalparts of isopropy dehy e and phenol 8 parts of tricresyl phosphate, parts of propylene glycol mono- 1parts of ethyl alcohol, 10

alcohol, 5 parts of hexanone and 5 partsof toluene.

In testimony whereof I have hereunto set my hand.

propyl ether, 15

oup with from 1 to 4 carbon atoms and n 1s 2, 3 or 4) and which cycloa HANS FINKELSTE'IN. f 

